Troubled Scott Disick voluntarily checked himself into rehab last month after his constant partying finally took its toll.

Since the 32-year-old has been at the Cliffside rehab centre in Malibu, momager Kris Jenner has been spotted making a visit with his three kids, but ex-partner Kourtney had yet to pay a visit - until now.

The mother-of-three took Mason, Penelope and baby Reign to see their father over the weekend along with sister Kylie.

Speaking about the visit, a source told Us magazine that the pair seemed to be on “decent terms” and Scott was naturally over the moon to see his kids.

Mason could be seen playing with a pair of binoculars (Image: X17)

Mason, five, could be seen playing with a pair of binoculars as he peered over a balcony at one point while Scott kept a protective hand on his back.

The source said: "Scott was really happy to see the kids and was very loving with them.

“He visited with them inside for awhile and then took them outside to admire the view from the balcony.”

The visit comes as it was reported that Scott will stay at the centre until early January.

According to RadarOnline, the 32-year-old promised Kourtney and Kris that he will remain in rehab for 90 days after they warned him they would fight his bid for joint custody if he left the programme early.

Kylie Jenner also paid the father-of-three a visit (Image: X17)

A source close to the star said: "Kris and Kourtney have set the terms that he is to stay in treatment for a total of 90 days, with the option to do outpatient after one month.

"They told him that anything less is not acceptable and will prevent him from obtaining joint custody.

"He was left with no other choice. Kris also told him that all of his friends are enablers and he has to get rid of them if he wants to really get better."

The source added that Scott was doing everything he could to get his life back on track.

They said: "Scott is actually taking this seriously. He told the them all that he will do whatever they want him to do so that he can remain a full-time father to his children."

Kourtney, 35, called time on her relationship with Scott in July after pictures emerged of him getting cosy with his ex Chloe Bartoli.

Their emotional break-up has been played out in the family's reality show, Keeping Up With the Kardashians, and Scott was seen breaking down in tears during a recent episode.

Addressing the split, he told the family: "It's been a really hard time, going from like, having all of you guys to having nobody.”